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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: Magn Reson Med. 2017 Oct 31;80(1):317–329. doi: 10.1002/mrm.26993

Figure 4.

Figure 4

Fractional anisotropy (A) and mean diffusivity (B) measurements as a function of fiber diameter measured with single-echo (circles) and multi-echo (squares) DTI for normal (black; 5% extracellular water volume fraction) and edematous (45% extracellular water volume fraction) muscle. Non-linear regression (red line) was fit to the normal muscle diffusion measurements measured with single-echo DTI. The equation for the fractional anisotropy regression is FA = (1.432 − 0.1134) * e−0.082*fibersize + 0.1134. The equation for the mean diffusivity regression is MD=2.94∗10−4mm2s+(1.30∗10−3mm2s)∗(1−e−.064∗fibersize).